32mm tyres

[Daninplymouth]

Just wanted to put a review up, I just changed from 28c to 32c gp5000 tyres. I have only done to short trips on them so far but seem really positive. I took about 15psi out of what I was running the 28s at but may try losing another 5psi and see how that goes. The ride seems a lot smoother and no noticeable effect on speed, although I will test this when I do my usual bigger loop. So if your debating going bigger on my early opinion I’d say go for it

 

[Ajax Bay]

How do they measure up (width), exactly? With what internal rim width and at what pressure?
I have clearance for 32mm with mudguards on a new (to me) build).
The GP4000s 28-622 always measured up larger than spec (for me on 15mm rims at 90psi) by maybe 2mm. I expected the 5000s to be similar but I fitted a GP5000 28-622 on the same rim and it came out on spec

 

[Daninplymouth]

How do they measure up (width), exactly? With what internal rim width and at what pressure?
I have clearance for 32mm with mudguards on a new (to me) build).
The GP4000s 28-622 always measured up larger than spec (for me on 15mm rims at 90psi) by maybe 2mm. I expected the 5000s to be similar but I fitted a GP5000 28-622 on the same rim and it came out on spec

My rims are 20mm internal. Have them set at 65 and 85psi. I had a quick look with some callipers and just measured the widest part and they were 31.5-32 so bang on size

 

[Daninplymouth]

Just to update after doing a couple more rides I have now set a couple of pbs on Strava so definitely minimal effect on speed and the comfort is greatly improved. Couldn’t do my high speed test, got a long 6-7mins all slightly downhill and went for it today but just before getting there I had gearing issues and lost half my gears 😡

 

[Ajax Bay]

"High speed test" differentials will be caused by aero changes (drag proportional to v^3) and wind conditions. Any reduction in tyre rolling resistance will have minimal effect, if one believes the maths (I do).
The run from Sharpitor to Yelverton is a cracker.

 

[Daninplymouth]

"High speed test" differentials will be caused by aero changes (drag proportional to v^3) and wind conditions. Any reduction in tyre rolling resistance will have minimal effect, if one believes the maths (I do).
The run from Sharpitor to Yelverton is a cracker.

Yes I know that but as iv been down the same road many times and I only head that way on a tailwind it would give a rough idea on how they compare

 

[Ming the Merciless]

Welcome to the 1980s

 

[dan_bo]

In 35 years of riding my bike I have never paid so much attention to my tyres. Get over it and keep on riding.